India, Nov. 10 -- Delhi's air quality remained in the "very poor" category even as the AQI reading showed a slight improvement on Tuesday, while the minimum temperature remained relatively high for this time of the year in the national capital.

Visibility conditions improved at both airport weather stations.

The air quality index (AQI) stood at 304 on Tuesday, in the 'very poor' category, indicating a slight improvement from the previous day. Despite the marginal dip, pollution levels remained a concern. At 9 am, PM 2.5 was the leading pollutant at 51 of the 57 monitoring stations.

At least 29 monitoring stations had AQI in the poor category, while two stations-Sri Aurobindo Marg and Delhi Cantonment-recorded AQI values of 161 and 170,...